JavaScript & Node.js course for Testers, QA and SDETs - 2026

Install Visual Studio Code from the official Microsoft page on Windows or Mac, verify installation with the code command, then use the editor to write JavaScript and Python across languages.

Create your first node project by setting up a workspace and initializing npm to generate package.json. Write a hello world program with console.log and run it using node in terminal.

Explore useful VS Code extensions from the marketplace, including prettier for automatic formatting, feature file editors, gitignore generators, and da script code snippets, with quick reloads to apply changes.

Learn how comments in DA script improve readability and are ignored by the interpreter. Cover three command types: single-line, multi-line, and aspect, with their syntax and a practical demo.

Explore JavaScript variable rules: name variables with letters, underscores, or dollar signs; avoid starting with numbers or system-reserved keywords. Learn case sensitivity, unique naming, multi-variable declarations, and undefined defaults.

Explore how JavaScript represents literals for string, number, boolean, object, array, regular expression, undefined, and null, and learn string templates, concatenation, and basic literal syntax.

Learn how to use the typeof operator in JavaScript to identify runtime data types, explore string, number, boolean, object, array, undefined, and null, and print results with template literals.

Explore falsy values and truthiness in JavaScript, including false, undefined, null, 0, empty string, and NaN, and understand boolean and numeric contexts to validate data in tests.

Convert data types using inbuilt global functions to parse strings into numbers and stringify numbers back to strings, using parseInt, parseFloat, Number(), plus operator, and toString.

Explore JavaScript data types: seven primitives and one object type; use typeof to identify types, and understand primitive immutability vs object mutability, with wrapper objects and string methods.

Explore how operators assign, change, or produce values and compare results using comparison operators. Identify unary, binary, and ternary operator categories, operands, and return types like numbers and booleans.

Explore JavaScript operators from assignment to logical and ternary operators, including arithmetic, comparison, equality, relational (in, instanceof), string concatenation, and unary operations, with test automation use cases.

Explore how to use logical operators in test automation, including and (&&), or (||), and not (!) in conditionals and defaults, and validate strings with typeof and length checks.

Explains how the logical or operator (||) works in JavaScript using a weekend check for Saturday or Sunday, noting that either condition can trigger execution.

Understand the logical not operator and truthy/falsy values, including false, undefined, null, 0, not a number, and empty string, to validate data and control if conditions in functions.

Apply the logical or operator to set a default browser value, using the left value when truthy and the right value when falsy, demonstrated with Chrome and Firefox.

Learn to use the ternary operator to return one of two values based on a boolean expression, and apply it to set log levels for local, remote, and cloud environments.

Use strict mode in JavaScript to prevent undeclared global variables and to forbid using reserved keywords as identifiers, improving code reliability. Enable it on the first line of your script.

Learn how conditional statements work, distinguish assignment from comparison, and master if-else logic, nested conditions, and Python-style elif, with boolean evaluation and false values.

Explore the if-not condition to validate data and throw errors for invalid values like undefined or empty strings. See how the message 'no valid data provided' signals an error.

Use if else to select between two actions based on a condition, such as reading a file when it exists or creating it when it does not.

Master nested if conditions with multiple branches and an else block where one path runs. Apply to test automation scenarios, handling system errors, business validation failures, data validation, and retries.

Master the switch case syntax by using switch with an expression, case labels, and break statements, plus the optional default to handle unmatched values.

Discover how loops iterate over collections in JavaScript to find specific elements or perform operations on all items, covering for, while, do-while, for-in, for-of loops with arrays and objects.

Offers a simple standard for loop example showing initial value, condition, and increment to print 0–10 with console.log, and demonstrates decrementing from 10 to 1.

Learn how to use a standard for loop to iterate arrays, filter numeric elements with typeof, and sum numbers using plus-equals, including control flow with continue and break.

Learn how the standard for loop uses the break statement to exit when a condition is met. See an example with browser window handles and switching to the target window.

Learn how to iterate arrays with the forEach method using a callback or arrow function. Access values, indices, and the entire array during iteration.

Use template literals to format strings by mixing static text with variables. Build dynamic email subjects, such as a bank statement, using start date, end date, and account number.

Explore string comparisons in JavaScript: perform full and partial matches with equals and includes, test startsWith and endsWith, manage case sensitivity with toUpperCase, and use trim for clean inputs.

Learn to extract year, month, and day from a string using JavaScript's slice method, preferred over substring, with start and end indices, optional parameters, and negative indexing.

Master JavaScript string replacement using replace and regex to handle patterns. Apply scenarios: strip file names, rename extensions, substitute templates, and format dates.

Explore how to extract substrings in JavaScript with the split method on strings. Use separators like spaces and dots to obtain dates, times, and file names and extensions.

Extract the application number from a log message by using indexOf to locate the left boundary, lastIndexOf for the right boundary, and slice with start+1 and end to obtain value.

Learn how backslashes act as escape characters in strings, enabling newline, tab, and literal quotes. Discover when a backslash is skipped or when it creates a valid escape sequence.

Explore anonymous functions and function expressions in JavaScript, and learn how callbacks work, how names can be assigned to variables, and the scope rules.

Learn how JavaScript function parameters work: default values, optional and undefined arguments, and handling multiple inputs such as full names, or an object or function passed as a parameter.

Explore the return statement across five scenarios—primitive values, expressions, objects, functions (including anonymous), and early returns via conditional logic, with notes on promises and callbacks.

Discover how to invoke a function automatically using the self-invoking pattern by wrapping it in parentheses and adding arguments, enabling quick unit testing and isolated execution.